Для Ани

main.cpp

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

int main() {
    srand(time(NULL));
    int str, slb;
    int kol=0;
    int sr=0;

    cout<<"vvedite stroki i stolbci"<<endl;
    str=rand()%15+1;
    slb=rand()%15+1;
    cout<<str<<"  "<<slb<<endl<<"vvedite elementi"<<endl;

    int arr[str][slb];
    for (int i=0; i<str; i++) {
        for (int j=0; j<slb; j++) {
            arr[i][j]=rand()%200-100;
            cout<<arr[i][j]<<"  ";
            if (arr[i][j]<-1) {
                sr+=arr[i][j];
                kol++;
            }
        }
        cout<<endl;
    }

    sr=sr/kol;
    cout<<"srednee ravno "<<sr<<endl;
    return 0;
}